Arthropods
An invertebrate that has an exoskeleton and jointed appendages.
(think about ARTHritis, a pain in the JOINTS.)

Their bodies are symetric bilaterally. (their bodies are the same on both sides)external image Parts2.gif

There are 3 parts to an arthropod
1. Head
2.Thorax
3.Abdomen


The arthropod's method of feeding and digestion is the tube within a tube body plan.

The earliest arhropds can be found in sediments as old as 500 million years that means they survived four mass extinctions.

Athropods are coelomates, which means that they have mesoderm lining and fluid filled cavities.


Different types of arthropods
1. insects - ex. grasshoppers, butterflies, beetles, ants, etc.
2. arachnids - ex. spiders, scorpions, ticks, mites, etc.
3. crustaceans - ex. crabs, shrimp, lobsters, etc.
4. chilopods - ex. cenitpedes
5. dilopods - ex. millipedes

external image CommonArthropods.jpg
arthropods can be found only a few miles from where we live!

What is an apendage(s) that some arthropods use hunting?
a. antenne
b. pincers
c. stingers
d. b and c